What are the reasons for delayed menstruation?

Patient's question:

I had my period on June 9th last month and took emergency contraception during that time. My period was supposed to come on July 7th this month, but it has been delayed by 11 days and has not arrived yet. I bought a pregnancy test and it came back negative. I would like to know what could be the reason for this delay? How long should the period be delayed before an ultrasound can be done to check for pregnancy?

Doctor's answer:

Hello, if the menstrual period is delayed by no more than one week, it is considered a normal situation. You can wait for a few more days.
Suggestions: If it hasn't arrived after more than a week and you are not pregnant, you should consider the possibility of a medical condition. You can take progesterone or Wuji Baifeng pills to induce menstruation or regulate your cycle. Pay attention to details in your daily life, maintain a balanced and nutritious diet, follow a regular lifestyle, and get enough rest. Otherwise, it may affect your health.

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